My adult female runner has started doing this "barking" noise. First she would just do one bark at a time, now she is doing a bunch of them. It seems like it only happens when she is out of the pen area, rooting around in the garden or manure pile or somewhere fun. She breathes normally, her eyes are clear and normal looking, no nasal discharge, she is active, I think she is laying, nothing looks odd. She is the first one out of the shed in the am, and right to the water. I first thought it was a happy noise, and it might be. But is has increased. No other ducks do it, but then again, she is the only female runner we have. I am willing to take her to the vet if it is necessary. But I have little to go on when I get her there. I am trying to get a video of it with my phone. It is weird and concerns me. But I don't want to subject her to getting put in a carrier, and going to the vet if I don't have to. Thanks for any ideas.